Difference between revisions of "ESP32"
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**As shipped, it has a VERY bad habit of detecting a brownout instead of starting WiFi upon reboot. Then it reboots itself & carries on. | **As shipped, it has a VERY bad habit of detecting a brownout instead of starting WiFi upon reboot. Then it reboots itself & carries on. | ||
**'''SOLUTION:''' 100 μF or bigger cap across 3v3 | **'''SOLUTION:''' 100 μF or bigger cap across 3v3 | ||
| + | **'''Well... NOPEish... The built-in regulator is pretty much shit.''' connect anything to it & it still fails to properly boot. | ||
*The 3rd type is from KeyeStudio & seems to be another FM-DevKit clone | *The 3rd type is from KeyeStudio & seems to be another FM-DevKit clone | ||
** UART: CP2102 | ** UART: CP2102 | ||
Latest revision as of 00:19, 10 August 2021
Contents
Notes
GPIO Pins
| GPIO | Arduino | Input | Output | Boot State | Strapping | Cap Touch | ADC | DAC | RTC | Notes | 1 | 2 | 3 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | (caution) | (caution) | T1 | ADC2_CH1 | RTC_GPIO11 |
|
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| 1 | TX pin | (caution) | HIGH |
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| 2 | T2 | ADC2_CH2 | RTC_GPIO12 |
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| 3 | (caution) | RX pin | HIGH |
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| 4 | T0 | ADC2_CH0 | RTC_GPIO10 | ||||||||||||
| 5 | HIGH | must be HIGH? | VSPI CS |
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| 6 | no | no |
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| 7 | no | no |
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| 8 | no | no |
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| 9 | no | no |
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| 10 | no | no |
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| 11 | no | no |
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| 12 | (caution) | must be LOW? | T5 | ADC2_CH5 | RTC_GPIO15 | HSPI MISO |
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| 13 | T4 | ADC2_CH4 | RTC_GPIO14 | HSPI MOSI | |||||||||||
| 14 | T6 | ADC2_CH6 | RTC_GPIO16 | HSPI CLK |
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| 15 | must be HIGH? | T3 | ADC2_CH3 | RTC_GPIO13 | HSPI CS |
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| 16 | |||||||||||||||
| 17 | |||||||||||||||
| 18 | VSPI CLK | ||||||||||||||
| 19 | VSPI MISO | ||||||||||||||
| 20 | |||||||||||||||
| 21 | I2C SDA | ||||||||||||||
| 22 | I2C SCL | ||||||||||||||
| 23 | VSPI MOSI | ||||||||||||||
| 24 | |||||||||||||||
| 25 | ADC2_CH8 | DAC1 | RTC_GPIO6 | ||||||||||||
| 26 | ADC2_CH9 | DAC2 | RTC_GPIO7 | ||||||||||||
| 27 | T7 | ADC2_CH7 | RTC_GPIO17 | ||||||||||||
| 28 | |||||||||||||||
| 29 | |||||||||||||||
| 30 | |||||||||||||||
| 31 | |||||||||||||||
| 32 | T9 | ADC1_CH4 | RTC_GPIO9 | ||||||||||||
| 33 | T8 | ADC1_CH5 | RTC_GPIO8 | ||||||||||||
| 34 | no | ADC1_CH6 | RTC_GPIO4 | ||||||||||||
| 35 | no | ADC1_CH7 | RTC_GPIO5 | ||||||||||||
| 36 | no | ADC1_CH0 | RTC_GPIO0 | ||||||||||||
| 37 | ADC1_CH1 | ||||||||||||||
| 38 | ADC1_CH2 | ||||||||||||||
| 39 | no | ADC1_CH3 | RTC_GPIO3 |
Modules
- The GOOD ones currently on hand are clones of the FM-DevKit
- UART: CP2102
- I have 2
- The ANNOYING one on hand is a "mini D1 ESP32" (Wemos clone...)
- UART: CP2104
- As shipped, it has a VERY bad habit of detecting a brownout instead of starting WiFi upon reboot. Then it reboots itself & carries on.
- SOLUTION: 100 μF or bigger cap across 3v3
- Well... NOPEish... The built-in regulator is pretty much shit. connect anything to it & it still fails to properly boot.
- The 3rd type is from KeyeStudio & seems to be another FM-DevKit clone
- UART: CP2102
- Interesting: M5Stack
- NEW PART DAY: THE $15 ESP32 WITH CELLULAR
ESP & Wired Ethernet
Firmware
Information Links
ESP32 pin allocation spreadsheet
